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Natural Draft Cooling Tower

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The natural draft cooling tower is a type of direct-contact cooling tower that is open to the air. It uses the principle of the heat exchanger to allow hot water from the system to be cooled by coming in direct contact with fresh air.

Hot and moisturized air rises to the top of the tower, while cold water gets collected at its base. This cooling tower is desirable for power plants that are located near load centers. This method does not require any cooling fans resulting in cost savings.

The natural draft cooling tower working includes evaporating a small amount of water which removes the heat from the water, and then the cooled water is recycled through the unit.

When heated water and fresh air are mixed, the latent heat of vaporization is released and it causes the water to decrease its temperature.

Natural draught cooling tower principle

The natural draft cooling tower gives the best efficiency in removing the heat from the hot water compared to the other types of the cooling tower. So, it is the best option to choose, for implementing in the industry as it has the following advantages:

  • The tower does not have fans, so it is economical in price.
  • It is power saving as it does not require power to run the fan.
  • Easy to operate
  • Maintenance cost is not high
  • There is no noise produced while running.
  • The smoke released from the top is environmental friendly.
  • The life span period might range from 8 to 16 years.
  • Operational safety
  • No corrosion problems

Application of a natural draft cooling tower

The natural cooling tower is used in the industry to remove the unwanted heat from the factory, which helps to increase the company’s production. Some of the applications of the draft cooling tower are:

  • Power stations
  • Oil refineries
  • Petrochemical plants
  • Natural gas plants



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